SAFE public projects git trees. - safe/jmp/linux-2.6/blob - sound/usb/pcm.c

   1 /*
   2  *   This program is free software; you can redistribute it and/or modify
   3  *   it under the terms of the GNU General Public License as published by
   4  *   the Free Software Foundation; either version 2 of the License, or
   5  *   (at your option) any later version.
   6  *
   7  *   This program is distributed in the hope that it will be useful,
   8  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  *   GNU General Public License for more details.
  11  *
  12  *   You should have received a copy of the GNU General Public License
  13  *   along with this program; if not, write to the Free Software
  14  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  15  */
  16
  17 #include <linux/init.h>
  18 #include <linux/usb.h>
  19 #include <linux/usb/audio.h>
  20
  21 #include <sound/core.h>
  22 #include <sound/pcm.h>
  23 #include <sound/pcm_params.h>
  24
  25 #include "usbaudio.h"
  26 #include "card.h"
  27 #include "quirks.h"
  28 #include "debug.h"
  29 #include "urb.h"
  30 #include "helper.h"
  31 #include "pcm.h"
  32
  33 /*
  34  * return the current pcm pointer.  just based on the hwptr_done value.
  35  */
  36 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
  37 {
  38         struct snd_usb_substream *subs;
  39         unsigned int hwptr_done;
  40
  41         subs = (struct snd_usb_substream *)substream->runtime->private_data;
  42         spin_lock(&subs->lock);
  43         hwptr_done = subs->hwptr_done;
  44         spin_unlock(&subs->lock);
  45         return hwptr_done / (substream->runtime->frame_bits >> 3);
  46 }
  47
  48 /*
  49  * find a matching audio format
  50  */
  51 static struct audioformat *find_format(struct snd_usb_substream *subs, unsigned int format,
  52                                        unsigned int rate, unsigned int channels)
  53 {
  54         struct list_head *p;
  55         struct audioformat *found = NULL;
  56         int cur_attr = 0, attr;
  57
  58         list_for_each(p, &subs->fmt_list) {
  59                 struct audioformat *fp;
  60                 fp = list_entry(p, struct audioformat, list);
  61                 if (!(fp->formats & (1uLL << format)))
  62                         continue;
  63                 if (fp->channels != channels)
  64                         continue;
  65                 if (rate < fp->rate_min || rate > fp->rate_max)
  66                         continue;
  67                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
  68                         unsigned int i;
  69                         for (i = 0; i < fp->nr_rates; i++)
  70                                 if (fp->rate_table[i] == rate)
  71                                         break;
  72                         if (i >= fp->nr_rates)
  73                                 continue;
  74                 }
  75                 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
  76                 if (! found) {
  77                         found = fp;
  78                         cur_attr = attr;
  79                         continue;
  80                 }
  81                 /* avoid async out and adaptive in if the other method
  82                  * supports the same format.
  83                  * this is a workaround for the case like
  84                  * M-audio audiophile USB.
  85                  */
  86                 if (attr != cur_attr) {
  87                         if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
  88                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
  89                             (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
  90                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
  91                                 continue;
  92                         if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
  93                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
  94                             (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
  95                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
  96                                 found = fp;
  97                                 cur_attr = attr;
  98                                 continue;
  99                         }
 100                 }
 101                 /* find the format with the largest max. packet size */
 102                 if (fp->maxpacksize > found->maxpacksize) {
 103                         found = fp;
 104                         cur_attr = attr;
 105                 }
 106         }
 107         return found;
 108 }
 109
 110 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
 111                          struct usb_host_interface *alts,
 112                          struct audioformat *fmt)
 113 {
 114         struct usb_device *dev = chip->dev;
 115         unsigned int ep;
 116         unsigned char data[1];
 117         int err;
 118
 119         ep = get_endpoint(alts, 0)->bEndpointAddress;
 120
 121         /* if endpoint doesn't have pitch control, bail out */
 122         if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
 123                 return 0;
 124
 125         data[0] = 1;
 126         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 127                                    USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 128                                    UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
 129                                    data, sizeof(data), 1000)) < 0) {
 130                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
 131                            dev->devnum, iface, ep);
 132                 return err;
 133         }
 134
 135         return 0;
 136 }
 137
 138 /*
 139  * initialize the picth control and sample rate
 140  */
 141 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
 142                        struct usb_host_interface *alts,
 143                        struct audioformat *fmt)
 144 {
 145         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
 146
 147         switch (altsd->bInterfaceProtocol) {
 148         case UAC_VERSION_1:
 149                 return init_pitch_v1(chip, iface, alts, fmt);
 150
 151         case UAC_VERSION_2:
 152                 /* not implemented yet */
 153                 return 0;
 154         }
 155
 156         return -EINVAL;
 157 }
 158
 159 static int set_sample_rate_v1(struct snd_usb_audio *chip, int iface,
 160                               struct usb_host_interface *alts,
 161                               struct audioformat *fmt, int rate)
 162 {
 163         struct usb_device *dev = chip->dev;
 164         unsigned int ep;
 165         unsigned char data[3];
 166         int err, crate;
 167
 168         ep = get_endpoint(alts, 0)->bEndpointAddress;
 169         /* if endpoint doesn't have sampling rate control, bail out */
 170         if (!(fmt->attributes & UAC_EP_CS_ATTR_SAMPLE_RATE)) {
 171                 snd_printk(KERN_WARNING "%d:%d:%d: endpoint lacks sample rate attribute bit, cannot set.\n",
 172                                    dev->devnum, iface, fmt->altsetting);
 173                 return 0;
 174         }
 175
 176         data[0] = rate;
 177         data[1] = rate >> 8;
 178         data[2] = rate >> 16;
 179         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 180                                    USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 181                                    UAC_EP_CS_ATTR_SAMPLE_RATE << 8, ep,
 182                                    data, sizeof(data), 1000)) < 0) {
 183                 snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d to ep %#x\n",
 184                            dev->devnum, iface, fmt->altsetting, rate, ep);
 185                 return err;
 186         }
 187         if ((err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC_GET_CUR,
 188                                    USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_IN,
 189                                    UAC_EP_CS_ATTR_SAMPLE_RATE << 8, ep,
 190                                    data, sizeof(data), 1000)) < 0) {
 191                 snd_printk(KERN_WARNING "%d:%d:%d: cannot get freq at ep %#x\n",
 192                            dev->devnum, iface, fmt->altsetting, ep);
 193                 return 0; /* some devices don't support reading */
 194         }
 195         crate = data[0] | (data[1] << 8) | (data[2] << 16);
 196         if (crate != rate) {
 197                 snd_printd(KERN_WARNING "current rate %d is different from the runtime rate %d\n", crate, rate);
 198                 // runtime->rate = crate;
 199         }
 200
 201         return 0;
 202 }
 203
 204 static int set_sample_rate_v2(struct snd_usb_audio *chip, int iface,
 205                               struct usb_host_interface *alts,
 206                               struct audioformat *fmt, int rate)
 207 {
 208         struct usb_device *dev = chip->dev;
 209         unsigned char data[4];
 210         int err, crate;
 211
 212         data[0] = rate;
 213         data[1] = rate >> 8;
 214         data[2] = rate >> 16;
 215         data[3] = rate >> 24;
 216         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
 217                                    USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
 218                                    0x0100, chip->clock_id << 8,
 219                                    data, sizeof(data), 1000)) < 0) {
 220                 snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d (v2)\n",
 221                            dev->devnum, iface, fmt->altsetting, rate);
 222                 return err;
 223         }
 224         if ((err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
 225                                    USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
 226                                    0x0100, chip->clock_id << 8,
 227                                    data, sizeof(data), 1000)) < 0) {
 228                 snd_printk(KERN_WARNING "%d:%d:%d: cannot get freq (v2)\n",
 229                            dev->devnum, iface, fmt->altsetting);
 230                 return err;
 231         }
 232         crate = data[0] | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
 233         if (crate != rate)
 234                 snd_printd(KERN_WARNING "current rate %d is different from the runtime rate %d\n", crate, rate);
 235
 236         return 0;
 237 }
 238
 239 int snd_usb_init_sample_rate(struct snd_usb_audio *chip, int iface,
 240                              struct usb_host_interface *alts,
 241                              struct audioformat *fmt, int rate)
 242 {
 243         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
 244
 245         switch (altsd->bInterfaceProtocol) {
 246         case UAC_VERSION_1:
 247                 return set_sample_rate_v1(chip, iface, alts, fmt, rate);
 248
 249         case UAC_VERSION_2:
 250                 return set_sample_rate_v2(chip, iface, alts, fmt, rate);
 251         }
 252
 253         return -EINVAL;
 254 }
 255
 256 /*
 257  * find a matching format and set up the interface
 258  */
 259 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 260 {
 261         struct usb_device *dev = subs->dev;
 262         struct usb_host_interface *alts;
 263         struct usb_interface_descriptor *altsd;
 264         struct usb_interface *iface;
 265         unsigned int ep, attr;
 266         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 267         int err;
 268
 269         iface = usb_ifnum_to_if(dev, fmt->iface);
 270         if (WARN_ON(!iface))
 271                 return -EINVAL;
 272         alts = &iface->altsetting[fmt->altset_idx];
 273         altsd = get_iface_desc(alts);
 274         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
 275                 return -EINVAL;
 276
 277         if (fmt == subs->cur_audiofmt)
 278                 return 0;
 279
 280         /* close the old interface */
 281         if (subs->interface >= 0 && subs->interface != fmt->iface) {
 282                 if (usb_set_interface(subs->dev, subs->interface, 0) < 0) {
 283                         snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed\n",
 284                                 dev->devnum, fmt->iface, fmt->altsetting);
 285                         return -EIO;
 286                 }
 287                 subs->interface = -1;
 288                 subs->altset_idx = 0;
 289         }
 290
 291         /* set interface */
 292         if (subs->interface != fmt->iface || subs->altset_idx != fmt->altset_idx) {
 293                 if (usb_set_interface(dev, fmt->iface, fmt->altsetting) < 0) {
 294                         snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed\n",
 295                                    dev->devnum, fmt->iface, fmt->altsetting);
 296                         return -EIO;
 297                 }
 298                 snd_printdd(KERN_INFO "setting usb interface %d:%d\n", fmt->iface, fmt->altsetting);
 299                 subs->interface = fmt->iface;
 300                 subs->altset_idx = fmt->altset_idx;
 301         }
 302
 303         /* create a data pipe */
 304         ep = fmt->endpoint & USB_ENDPOINT_NUMBER_MASK;
 305         if (is_playback)
 306                 subs->datapipe = usb_sndisocpipe(dev, ep);
 307         else
 308                 subs->datapipe = usb_rcvisocpipe(dev, ep);
 309         subs->datainterval = fmt->datainterval;
 310         subs->syncpipe = subs->syncinterval = 0;
 311         subs->maxpacksize = fmt->maxpacksize;
 312         subs->fill_max = 0;
 313
 314         /* we need a sync pipe in async OUT or adaptive IN mode */
 315         /* check the number of EP, since some devices have broken
 316          * descriptors which fool us.  if it has only one EP,
 317          * assume it as adaptive-out or sync-in.
 318          */
 319         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 320         if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
 321              (! is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
 322             altsd->bNumEndpoints >= 2) {
 323                 /* check sync-pipe endpoint */
 324                 /* ... and check descriptor size before accessing bSynchAddress
 325                    because there is a version of the SB Audigy 2 NX firmware lacking
 326                    the audio fields in the endpoint descriptors */
 327                 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
 328                     (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 329                      get_endpoint(alts, 1)->bSynchAddress != 0)) {
 330                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
 331                                    dev->devnum, fmt->iface, fmt->altsetting);
 332                         return -EINVAL;
 333                 }
 334                 ep = get_endpoint(alts, 1)->bEndpointAddress;
 335                 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 336                     (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 337                      (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 338                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
 339                                    dev->devnum, fmt->iface, fmt->altsetting);
 340                         return -EINVAL;
 341                 }
 342                 ep &= USB_ENDPOINT_NUMBER_MASK;
 343                 if (is_playback)
 344                         subs->syncpipe = usb_rcvisocpipe(dev, ep);
 345                 else
 346                         subs->syncpipe = usb_sndisocpipe(dev, ep);
 347                 if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 348                     get_endpoint(alts, 1)->bRefresh >= 1 &&
 349                     get_endpoint(alts, 1)->bRefresh <= 9)
 350                         subs->syncinterval = get_endpoint(alts, 1)->bRefresh;
 351                 else if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
 352                         subs->syncinterval = 1;
 353                 else if (get_endpoint(alts, 1)->bInterval >= 1 &&
 354                          get_endpoint(alts, 1)->bInterval <= 16)
 355                         subs->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
 356                 else
 357                         subs->syncinterval = 3;
 358         }
 359
 360         /* always fill max packet size */
 361         if (fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX)
 362                 subs->fill_max = 1;
 363
 364         if ((err = snd_usb_init_pitch(subs->stream->chip, subs->interface, alts, fmt)) < 0)
 365                 return err;
 366
 367         subs->cur_audiofmt = fmt;
 368
 369         snd_usb_set_format_quirk(subs, fmt);
 370
 371 #if 0
 372         printk(KERN_DEBUG
 373                "setting done: format = %d, rate = %d..%d, channels = %d\n",
 374                fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
 375         printk(KERN_DEBUG
 376                "  datapipe = 0x%0x, syncpipe = 0x%0x\n",
 377                subs->datapipe, subs->syncpipe);
 378 #endif
 379
 380         return 0;
 381 }
 382
 383 /*
 384  * hw_params callback
 385  *
 386  * allocate a buffer and set the given audio format.
 387  *
 388  * so far we use a physically linear buffer although packetize transfer
 389  * doesn't need a continuous area.
 390  * if sg buffer is supported on the later version of alsa, we'll follow
 391  * that.
 392  */
 393 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 394                              struct snd_pcm_hw_params *hw_params)
 395 {
 396         struct snd_usb_substream *subs = substream->runtime->private_data;
 397         struct audioformat *fmt;
 398         unsigned int channels, rate, format;
 399         int ret, changed;
 400
 401         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 402                                                params_buffer_bytes(hw_params));
 403         if (ret < 0)
 404                 return ret;
 405
 406         format = params_format(hw_params);
 407         rate = params_rate(hw_params);
 408         channels = params_channels(hw_params);
 409         fmt = find_format(subs, format, rate, channels);
 410         if (!fmt) {
 411                 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
 412                            format, rate, channels);
 413                 return -EINVAL;
 414         }
 415
 416         changed = subs->cur_audiofmt != fmt ||
 417                 subs->period_bytes != params_period_bytes(hw_params) ||
 418                 subs->cur_rate != rate;
 419         if ((ret = set_format(subs, fmt)) < 0)
 420                 return ret;
 421
 422         if (subs->cur_rate != rate) {
 423                 struct usb_host_interface *alts;
 424                 struct usb_interface *iface;
 425                 iface = usb_ifnum_to_if(subs->dev, fmt->iface);
 426                 alts = &iface->altsetting[fmt->altset_idx];
 427                 ret = snd_usb_init_sample_rate(subs->stream->chip, subs->interface, alts, fmt, rate);
 428                 if (ret < 0)
 429                         return ret;
 430                 subs->cur_rate = rate;
 431         }
 432
 433         if (changed) {
 434                 /* format changed */
 435                 snd_usb_release_substream_urbs(subs, 0);
 436                 /* influenced: period_bytes, channels, rate, format, */
 437                 ret = snd_usb_init_substream_urbs(subs, params_period_bytes(hw_params),
 438                                                   params_rate(hw_params),
 439                                                   snd_pcm_format_physical_width(params_format(hw_params)) *
 440                                                         params_channels(hw_params));
 441         }
 442
 443         return ret;
 444 }
 445
 446 /*
 447  * hw_free callback
 448  *
 449  * reset the audio format and release the buffer
 450  */
 451 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 452 {
 453         struct snd_usb_substream *subs = substream->runtime->private_data;
 454
 455         subs->cur_audiofmt = NULL;
 456         subs->cur_rate = 0;
 457         subs->period_bytes = 0;
 458         if (!subs->stream->chip->shutdown)
 459                 snd_usb_release_substream_urbs(subs, 0);
 460         return snd_pcm_lib_free_vmalloc_buffer(substream);
 461 }
 462
 463 /*
 464  * prepare callback
 465  *
 466  * only a few subtle things...
 467  */
 468 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 469 {
 470         struct snd_pcm_runtime *runtime = substream->runtime;
 471         struct snd_usb_substream *subs = runtime->private_data;
 472
 473         if (! subs->cur_audiofmt) {
 474                 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
 475                 return -ENXIO;
 476         }
 477
 478         /* some unit conversions in runtime */
 479         subs->maxframesize = bytes_to_frames(runtime, subs->maxpacksize);
 480         subs->curframesize = bytes_to_frames(runtime, subs->curpacksize);
 481
 482         /* reset the pointer */
 483         subs->hwptr_done = 0;
 484         subs->transfer_done = 0;
 485         subs->phase = 0;
 486         runtime->delay = 0;
 487
 488         return snd_usb_substream_prepare(subs, runtime);
 489 }
 490
 491 static struct snd_pcm_hardware snd_usb_hardware =
 492 {
 493         .info =                 SNDRV_PCM_INFO_MMAP |
 494                                 SNDRV_PCM_INFO_MMAP_VALID |
 495                                 SNDRV_PCM_INFO_BATCH |
 496                                 SNDRV_PCM_INFO_INTERLEAVED |
 497                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 498                                 SNDRV_PCM_INFO_PAUSE,
 499         .buffer_bytes_max =     1024 * 1024,
 500         .period_bytes_min =     64,
 501         .period_bytes_max =     512 * 1024,
 502         .periods_min =          2,
 503         .periods_max =          1024,
 504 };
 505
 506 static int hw_check_valid_format(struct snd_usb_substream *subs,
 507                                  struct snd_pcm_hw_params *params,
 508                                  struct audioformat *fp)
 509 {
 510         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 511         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 512         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 513         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 514         struct snd_mask check_fmts;
 515         unsigned int ptime;
 516
 517         /* check the format */
 518         snd_mask_none(&check_fmts);
 519         check_fmts.bits[0] = (u32)fp->formats;
 520         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 521         snd_mask_intersect(&check_fmts, fmts);
 522         if (snd_mask_empty(&check_fmts)) {
 523                 hwc_debug("   > check: no supported format %d\n", fp->format);
 524                 return 0;
 525         }
 526         /* check the channels */
 527         if (fp->channels < ct->min || fp->channels > ct->max) {
 528                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 529                 return 0;
 530         }
 531         /* check the rate is within the range */
 532         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 533                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 534                 return 0;
 535         }
 536         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 537                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 538                 return 0;
 539         }
 540         /* check whether the period time is >= the data packet interval */
 541         if (snd_usb_get_speed(subs->dev) == USB_SPEED_HIGH) {
 542                 ptime = 125 * (1 << fp->datainterval);
 543                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 544                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 545                         return 0;
 546                 }
 547         }
 548         return 1;
 549 }
 550
 551 static int hw_rule_rate(struct snd_pcm_hw_params *params,
 552                         struct snd_pcm_hw_rule *rule)
 553 {
 554         struct snd_usb_substream *subs = rule->private;
 555         struct list_head *p;
 556         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 557         unsigned int rmin, rmax;
 558         int changed;
 559
 560         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
 561         changed = 0;
 562         rmin = rmax = 0;
 563         list_for_each(p, &subs->fmt_list) {
 564                 struct audioformat *fp;
 565                 fp = list_entry(p, struct audioformat, list);
 566                 if (!hw_check_valid_format(subs, params, fp))
 567                         continue;
 568                 if (changed++) {
 569                         if (rmin > fp->rate_min)
 570                                 rmin = fp->rate_min;
 571                         if (rmax < fp->rate_max)
 572                                 rmax = fp->rate_max;
 573                 } else {
 574                         rmin = fp->rate_min;
 575                         rmax = fp->rate_max;
 576                 }
 577         }
 578
 579         if (!changed) {
 580                 hwc_debug("  --> get empty\n");
 581                 it->empty = 1;
 582                 return -EINVAL;
 583         }
 584
 585         changed = 0;
 586         if (it->min < rmin) {
 587                 it->min = rmin;
 588                 it->openmin = 0;
 589                 changed = 1;
 590         }
 591         if (it->max > rmax) {
 592                 it->max = rmax;
 593                 it->openmax = 0;
 594                 changed = 1;
 595         }
 596         if (snd_interval_checkempty(it)) {
 597                 it->empty = 1;
 598                 return -EINVAL;
 599         }
 600         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 601         return changed;
 602 }
 603
 604
 605 static int hw_rule_channels(struct snd_pcm_hw_params *params,
 606                             struct snd_pcm_hw_rule *rule)
 607 {
 608         struct snd_usb_substream *subs = rule->private;
 609         struct list_head *p;
 610         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 611         unsigned int rmin, rmax;
 612         int changed;
 613
 614         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
 615         changed = 0;
 616         rmin = rmax = 0;
 617         list_for_each(p, &subs->fmt_list) {
 618                 struct audioformat *fp;
 619                 fp = list_entry(p, struct audioformat, list);
 620                 if (!hw_check_valid_format(subs, params, fp))
 621                         continue;
 622                 if (changed++) {
 623                         if (rmin > fp->channels)
 624                                 rmin = fp->channels;
 625                         if (rmax < fp->channels)
 626                                 rmax = fp->channels;
 627                 } else {
 628                         rmin = fp->channels;
 629                         rmax = fp->channels;
 630                 }
 631         }
 632
 633         if (!changed) {
 634                 hwc_debug("  --> get empty\n");
 635                 it->empty = 1;
 636                 return -EINVAL;
 637         }
 638
 639         changed = 0;
 640         if (it->min < rmin) {
 641                 it->min = rmin;
 642                 it->openmin = 0;
 643                 changed = 1;
 644         }
 645         if (it->max > rmax) {
 646                 it->max = rmax;
 647                 it->openmax = 0;
 648                 changed = 1;
 649         }
 650         if (snd_interval_checkempty(it)) {
 651                 it->empty = 1;
 652                 return -EINVAL;
 653         }
 654         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 655         return changed;
 656 }
 657
 658 static int hw_rule_format(struct snd_pcm_hw_params *params,
 659                           struct snd_pcm_hw_rule *rule)
 660 {
 661         struct snd_usb_substream *subs = rule->private;
 662         struct list_head *p;
 663         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 664         u64 fbits;
 665         u32 oldbits[2];
 666         int changed;
 667
 668         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
 669         fbits = 0;
 670         list_for_each(p, &subs->fmt_list) {
 671                 struct audioformat *fp;
 672                 fp = list_entry(p, struct audioformat, list);
 673                 if (!hw_check_valid_format(subs, params, fp))
 674                         continue;
 675                 fbits |= fp->formats;
 676         }
 677
 678         oldbits[0] = fmt->bits[0];
 679         oldbits[1] = fmt->bits[1];
 680         fmt->bits[0] &= (u32)fbits;
 681         fmt->bits[1] &= (u32)(fbits >> 32);
 682         if (!fmt->bits[0] && !fmt->bits[1]) {
 683                 hwc_debug("  --> get empty\n");
 684                 return -EINVAL;
 685         }
 686         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
 687         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
 688         return changed;
 689 }
 690
 691 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
 692                                struct snd_pcm_hw_rule *rule)
 693 {
 694         struct snd_usb_substream *subs = rule->private;
 695         struct audioformat *fp;
 696         struct snd_interval *it;
 697         unsigned char min_datainterval;
 698         unsigned int pmin;
 699         int changed;
 700
 701         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 702         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
 703         min_datainterval = 0xff;
 704         list_for_each_entry(fp, &subs->fmt_list, list) {
 705                 if (!hw_check_valid_format(subs, params, fp))
 706                         continue;
 707                 min_datainterval = min(min_datainterval, fp->datainterval);
 708         }
 709         if (min_datainterval == 0xff) {
 710                 hwc_debug("  --> get emtpy\n");
 711                 it->empty = 1;
 712                 return -EINVAL;
 713         }
 714         pmin = 125 * (1 << min_datainterval);
 715         changed = 0;
 716         if (it->min < pmin) {
 717                 it->min = pmin;
 718                 it->openmin = 0;
 719                 changed = 1;
 720         }
 721         if (snd_interval_checkempty(it)) {
 722                 it->empty = 1;
 723                 return -EINVAL;
 724         }
 725         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
 726         return changed;
 727 }
 728
 729 /*
 730  *  If the device supports unusual bit rates, does the request meet these?
 731  */
 732 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
 733                                   struct snd_usb_substream *subs)
 734 {
 735         struct audioformat *fp;
 736         int count = 0, needs_knot = 0;
 737         int err;
 738
 739         list_for_each_entry(fp, &subs->fmt_list, list) {
 740                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
 741                         return 0;
 742                 count += fp->nr_rates;
 743                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
 744                         needs_knot = 1;
 745         }
 746         if (!needs_knot)
 747                 return 0;
 748
 749         subs->rate_list.count = count;
 750         subs->rate_list.list = kmalloc(sizeof(int) * count, GFP_KERNEL);
 751         subs->rate_list.mask = 0;
 752         count = 0;
 753         list_for_each_entry(fp, &subs->fmt_list, list) {
 754                 int i;
 755                 for (i = 0; i < fp->nr_rates; i++)
 756                         subs->rate_list.list[count++] = fp->rate_table[i];
 757         }
 758         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 759                                          &subs->rate_list);
 760         if (err < 0)
 761                 return err;
 762
 763         return 0;
 764 }
 765
 766
 767 /*
 768  * set up the runtime hardware information.
 769  */
 770
 771 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
 772 {
 773         struct list_head *p;
 774         unsigned int pt, ptmin;
 775         int param_period_time_if_needed;
 776         int err;
 777
 778         runtime->hw.formats = subs->formats;
 779
 780         runtime->hw.rate_min = 0x7fffffff;
 781         runtime->hw.rate_max = 0;
 782         runtime->hw.channels_min = 256;
 783         runtime->hw.channels_max = 0;
 784         runtime->hw.rates = 0;
 785         ptmin = UINT_MAX;
 786         /* check min/max rates and channels */
 787         list_for_each(p, &subs->fmt_list) {
 788                 struct audioformat *fp;
 789                 fp = list_entry(p, struct audioformat, list);
 790                 runtime->hw.rates |= fp->rates;
 791                 if (runtime->hw.rate_min > fp->rate_min)
 792                         runtime->hw.rate_min = fp->rate_min;
 793                 if (runtime->hw.rate_max < fp->rate_max)
 794                         runtime->hw.rate_max = fp->rate_max;
 795                 if (runtime->hw.channels_min > fp->channels)
 796                         runtime->hw.channels_min = fp->channels;
 797                 if (runtime->hw.channels_max < fp->channels)
 798                         runtime->hw.channels_max = fp->channels;
 799                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
 800                         /* FIXME: there might be more than one audio formats... */
 801                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
 802                                 fp->frame_size;
 803                 }
 804                 pt = 125 * (1 << fp->datainterval);
 805                 ptmin = min(ptmin, pt);
 806         }
 807
 808         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
 809         if (snd_usb_get_speed(subs->dev) != USB_SPEED_HIGH)
 810                 /* full speed devices have fixed data packet interval */
 811                 ptmin = 1000;
 812         if (ptmin == 1000)
 813                 /* if period time doesn't go below 1 ms, no rules needed */
 814                 param_period_time_if_needed = -1;
 815         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 816                                      ptmin, UINT_MAX);
 817
 818         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 819                                        hw_rule_rate, subs,
 820                                        SNDRV_PCM_HW_PARAM_FORMAT,
 821                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 822                                        param_period_time_if_needed,
 823                                        -1)) < 0)
 824                 return err;
 825         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 826                                        hw_rule_channels, subs,
 827                                        SNDRV_PCM_HW_PARAM_FORMAT,
 828                                        SNDRV_PCM_HW_PARAM_RATE,
 829                                        param_period_time_if_needed,
 830                                        -1)) < 0)
 831                 return err;
 832         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
 833                                        hw_rule_format, subs,
 834                                        SNDRV_PCM_HW_PARAM_RATE,
 835                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 836                                        param_period_time_if_needed,
 837                                        -1)) < 0)
 838                 return err;
 839         if (param_period_time_if_needed >= 0) {
 840                 err = snd_pcm_hw_rule_add(runtime, 0,
 841                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 842                                           hw_rule_period_time, subs,
 843                                           SNDRV_PCM_HW_PARAM_FORMAT,
 844                                           SNDRV_PCM_HW_PARAM_CHANNELS,
 845                                           SNDRV_PCM_HW_PARAM_RATE,
 846                                           -1);
 847                 if (err < 0)
 848                         return err;
 849         }
 850         if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
 851                 return err;
 852         return 0;
 853 }
 854
 855 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
 856 {
 857         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 858         struct snd_pcm_runtime *runtime = substream->runtime;
 859         struct snd_usb_substream *subs = &as->substream[direction];
 860
 861         subs->interface = -1;
 862         subs->altset_idx = 0;
 863         runtime->hw = snd_usb_hardware;
 864         runtime->private_data = subs;
 865         subs->pcm_substream = substream;
 866         return setup_hw_info(runtime, subs);
 867 }
 868
 869 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
 870 {
 871         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 872         struct snd_usb_substream *subs = &as->substream[direction];
 873
 874         if (!as->chip->shutdown && subs->interface >= 0) {
 875                 usb_set_interface(subs->dev, subs->interface, 0);
 876                 subs->interface = -1;
 877         }
 878         subs->pcm_substream = NULL;
 879         return 0;
 880 }
 881
 882 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
 883 {
 884         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
 885 }
 886
 887 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
 888 {
 889         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
 890 }
 891
 892 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
 893 {
 894         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
 895 }
 896
 897 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
 898 {
 899         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
 900 }
 901
 902 static struct snd_pcm_ops snd_usb_playback_ops = {
 903         .open =         snd_usb_playback_open,
 904         .close =        snd_usb_playback_close,
 905         .ioctl =        snd_pcm_lib_ioctl,
 906         .hw_params =    snd_usb_hw_params,
 907         .hw_free =      snd_usb_hw_free,
 908         .prepare =      snd_usb_pcm_prepare,
 909         .trigger =      snd_usb_substream_playback_trigger,
 910         .pointer =      snd_usb_pcm_pointer,
 911         .page =         snd_pcm_lib_get_vmalloc_page,
 912         .mmap =         snd_pcm_lib_mmap_vmalloc,
 913 };
 914
 915 static struct snd_pcm_ops snd_usb_capture_ops = {
 916         .open =         snd_usb_capture_open,
 917         .close =        snd_usb_capture_close,
 918         .ioctl =        snd_pcm_lib_ioctl,
 919         .hw_params =    snd_usb_hw_params,
 920         .hw_free =      snd_usb_hw_free,
 921         .prepare =      snd_usb_pcm_prepare,
 922         .trigger =      snd_usb_substream_capture_trigger,
 923         .pointer =      snd_usb_pcm_pointer,
 924         .page =         snd_pcm_lib_get_vmalloc_page,
 925         .mmap =         snd_pcm_lib_mmap_vmalloc,
 926 };
 927
 928 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
 929 {
 930         snd_pcm_set_ops(pcm, stream,
 931                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
 932                         &snd_usb_playback_ops : &snd_usb_capture_ops);
 933 }